Bulletin - Arizona State Bureau of Mines, Issues 81-100University of Arizona, 1918 - Mines and mineral resources |
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acid adit ammonia Arizona Bulletin Arizona Bureau August 24 Barite barium barium oxide barytes bead blowpipe borax Bureau of Mines carbonate carelessness cause cent charcoal Chemical claim class matter Novem co-operation color committee Company copper cost dangerous deposits Director TUCSON duty efficiency employees engineer equipment feet fire flame foreman fuse germs give guards heated hoisting hydrochloric hydrochloric muriatic incline injury inspection interest iron knife blade Liberty Bonds lithopone located machine manganese dioxide methods Minimum percentage manganese Minimum percentage metallic occur operation organization oxide percentage manganese dioxide percentage metallic manganese phosphorus plant postoffice at Tucson practices production proper psilomelane pyrolusite result rhodochrosite rules S. C. DICKINSON safe safety SAFETY ENGINEER scheelite Science Library silica soda sodium carbonate solution Specific Gravity spiegeleisen Steel sulphide superintendent surface things tion University of Arizona vein vertical shaft wire workmen York zinc